Aluminum
surfaces should be free of dirt, grease, mildew, and other contaminants
prior to painting:
- Treat any mildew with a 3:1 water:household
bleach mixture, leaving it on for 20 minutes and adding more
as it dries; wear eye and skin protection; rinse thoroughly
- If there is any white oxide on bare metal,
remove as much as possible by rubbing with non-metallic scouring
pad (note: if steel wool is used, residual particles, if not
completely removed, can eat pin holes through the aluminum)
- Remove dirt, chalk, treated mildew, etc.
by scrubbing with detergent and water, and rinse thoroughly;
or power wash with plain water; chalking on weathered aluminum
siding tends to be deep in the factory finish, and a second
treatment may be necessary if there is still noticeable chalk
on the surface
- Grease, dirt, oil, and other contaminants
can also be removed by cleaning according to SSPC SP-1, Solvent
Cleaning
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